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REVIEW ARTICLES: General Lectures

High Strain Rate Behavior of Metals

[+] Author and Article Information
R. J. Clifton

Division of Engineering, Brown University, Providence RI 02912

Appl. Mech. Rev 43(5S), S9-S22 (May 01, 1990) doi:10.1115/1.3120862 History: Online April 30, 2009

Abstract

Experimental results on the high strain rate response of polycrystalline metals are reviewed, with emphasis on the behavior of pure metals. A strong increase in flow stress with increasing strain rate is reported for strain rates of approximately 105 s−1 and higher. This increase is observed in pressure-shear plate impact experiments at nominally constant strain rates from 105 s−1 to 106 s−1 . To improve understanding of the increased rate sensitivity at high strain rates, pressure-shear, strain-rate-change experiments have been conducted on OFHC copper specimens. These experiments have been analyzed using a conventional viscoplasticity formulation and an internal variable formulation in which the hardening rate depends on the rate of deformation. Only the latter formulation is successful in describing the observed response to the change in strain rate. This observation is discussed in terms of its implications for interpreting other dynamic plasticity experiments and for improved understanding of the underlying dislocation mechanisms. The enhanced rate sensitivity at high strain rates is concluded to be related primarily to the rate sensitivity of strain hardening, not the rate sensitivity of the flow stress at constant structure.

Copyright © 1990 by American Society of Mechanical Engineers
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